Ventilator fan for a ventilation system



FIG. 1 is a front view of a ventilator fan for a ventilation system;

FIG. 2 is a rear view of the ventilator fan for a ventilation system from FIG. 1;

FIG. 3 is a perspective side view of the ventilator fan for a ventilation system from FIG. 1;

FIG. 4 is a side elevation view of the ventilator fan for a ventilation system from FIG. 1; and,

FIG. 5 is a perspective side view of the ventilator fan for a ventilation system from FIG. 1. 

CLAIM The ornamental design for a ventilator fan for a ventilation system, as shown and described. 